merge: remove fixed investigator ticket role

.yoi/workflow/ticket-intake-workflow.md

@@ -22,7 +22,7 @@ User request / conversation
 
 - `Ticket` は durable orchestration record。
 - `Task` は session-local progress tracking。
-- `Assignment` は Orchestrator から coder / reviewer / investigator Pod への具体的委譲。
+- `Assignment` は Orchestrator から coder / reviewer Pod、または task-specific helper Pod への具体的委譲。
 - `IntentPacket` は Ticket から抽出して Assignment に渡す短い実装・レビュー契約。
 
 Intake は、要件同期と Ticket 化を担当する。実装の起動・worktree 作成・review 委譲・merge 判断は Orchestrator 側の責務である。`ready` は Orchestrator が routing できる状態を意味し、実装戦術がすべて事前固定されていることを意味しない。
@@ -47,7 +47,7 @@ Intake は以下を行う。
 
 ## Intake がしないこと
 
-- coder / reviewer / investigator Pod を起動しない。
+- coder / reviewer Pod や read-only investigation helper Pod を起動しない。
 - worktree を作らない。
 - merge / close / branch cleanup をしない。
 - implementation-ready でない Ticket を実装に投げない。

.yoi/workflow/ticket-orchestrator-routing.md

@@ -50,7 +50,7 @@ Orchestrator は以下を行う。
 - 自動 scheduler として unattended に実行しない。
 - Panel Queue / queued notification だけを unattended scheduler trigger として扱わない。
 - `queued -> inprogress` acceptance なしに worktree 作成、implementation Pod `SpawnPod`、coder/reviewer routing を行わない。
-- 人間/上位 Orchestrator の許可または明示的な routing acceptance なしに coder / reviewer / investigator Pod を起動しない。
+- 人間/上位 Orchestrator の許可または明示的な routing acceptance なしに coder / reviewer Pod や read-only investigation helper Pod を起動しない。
 - 設計境界の未決定を勝手に implementation-ready として固定しない。
 - merge / close / cleanup 権限を持たない場面で勝手に完了処理しない。
 - Ticket tools があるからといって arbitrary filesystem write を行わない。
@@ -139,7 +139,7 @@ Action:
 Action:
 
 - read-only investigation を提案する。
-- 許可があれば investigator Pod を read-only scope で起動できる。
+- 許可があれば task-specific read-only helper Pod を普通の scoped Pod として起動できる。
 - `TicketComment` に調査問い・scope・完了条件を記録する。
 - 実装 worktree はまだ作らない。
 

crates/client/src/ticket_role.rs

@@ -553,7 +553,7 @@ fn append_role_execution_guidance(out: &mut String, role: TicketRole) {
         TicketRole::Orchestrator => append_orchestrator_agent_routing_guidance(out),
         TicketRole::Coder => append_coder_agent_routing_guidance(out),
         TicketRole::Reviewer => append_reviewer_agent_routing_guidance(out),
-        TicketRole::Intake | TicketRole::Investigator => {}
+        TicketRole::Intake => {}
     }
 }
 

crates/ticket/src/config.rs

@@ -194,25 +194,26 @@ pub enum TicketRole {
     Orchestrator,
     Coder,
     Reviewer,
-    Investigator,
 }
 
 impl TicketRole {
-    pub const ALL: [TicketRole; 5] = [
+    pub const ALL: [TicketRole; 4] = [
         TicketRole::Intake,
         TicketRole::Orchestrator,
         TicketRole::Coder,
         TicketRole::Reviewer,
-        TicketRole::Investigator,
     ];
 
+    pub fn supported_names() -> Vec<&'static str> {
+        Self::ALL.iter().map(|role| role.as_str()).collect()
+    }
+
     pub fn as_str(self) -> &'static str {
         match self {
             Self::Intake => "intake",
             Self::Orchestrator => "orchestrator",
             Self::Coder => "coder",
             Self::Reviewer => "reviewer",
-            Self::Investigator => "investigator",
         }
     }
 
@@ -222,7 +223,6 @@ impl TicketRole {
             "orchestrator" => Some(Self::Orchestrator),
             "coder" => Some(Self::Coder),
             "reviewer" => Some(Self::Reviewer),
-            "investigator" => Some(Self::Investigator),
             _ => None,
         }
     }
@@ -232,7 +232,6 @@ impl TicketRole {
             Self::Intake => "ticket-intake-workflow",
             Self::Orchestrator => "ticket-orchestrator-routing",
             Self::Coder | Self::Reviewer => "multi-agent-workflow",
-            Self::Investigator => "ticket-orchestrator-routing",
         }
     }
 }
@@ -550,7 +549,10 @@ impl RawTicketConfig {
         for (name, raw_role) in self.roles {
             let role = TicketRole::parse(&name).ok_or_else(|| TicketConfigError::Invalid {
                 path: path.to_path_buf(),
-                message: format!("unknown Ticket role `{name}`"),
+                message: format!(
+                    "unsupported Ticket role `{name}`; supported fixed roles: {}",
+                    TicketRole::supported_names().join(", ")
+                ),
             })?;
             let profile_configured = raw_role.profile.is_some();
             roles.inner.insert(role, raw_role.resolve(role));
@@ -711,11 +713,6 @@ workflow = "multi-agent-workflow"
 profile = "project:reviewer"
 launch_prompt = "$workspace/ticket/reviewer/launch"
 workflow = "multi-agent-workflow"
-
-[roles.investigator]
-profile = "default"
-launch_prompt = "$workspace/ticket/investigator/launch"
-workflow = "ticket-orchestrator-routing"
 "#,
         );
 
@@ -738,8 +735,8 @@ workflow = "ticket-orchestrator-routing"
             "$workspace/ticket/reviewer/launch"
         );
         assert_eq!(
-            config.workflow_for(TicketRole::Investigator).as_str(),
-            "ticket-orchestrator-routing"
+            config.workflow_for(TicketRole::Reviewer).as_str(),
+            "multi-agent-workflow"
         );
     }
 
@@ -759,6 +756,7 @@ workflow = "ticket-orchestrator-routing"
                 role.default_workflow()
             )));
         }
+        assert!(!scaffold.contains("[roles.investigator]"));
 
         let config = TicketConfig::from_toml(
             temp.path(),
@@ -899,7 +897,41 @@ profile = "inherit"
         );
 
         let error = TicketConfig::load_workspace(temp.path()).unwrap_err();
-        assert!(error.to_string().contains("unknown Ticket role `operator`"));
+        assert!(
+            error
+                .to_string()
+                .contains("unsupported Ticket role `operator`")
+        );
+        assert!(
+            error
+                .to_string()
+                .contains("intake, orchestrator, coder, reviewer")
+        );
+    }
+
+    #[test]
+    fn stale_investigator_role_config_is_rejected() {
+        let temp = TempDir::new().unwrap();
+        write_config(
+            temp.path(),
+            r#"
+[roles.investigator]
+profile = "builtin:default"
+workflow = "ticket-orchestrator-routing"
+"#,
+        );
+
+        let error = TicketConfig::load_workspace(temp.path()).unwrap_err();
+        assert!(
+            error
+                .to_string()
+                .contains("unsupported Ticket role `investigator`")
+        );
+        assert!(
+            error
+                .to_string()
+                .contains("intake, orchestrator, coder, reviewer")
+        );
     }
 
     #[test]

crates/yoi/src/ticket_cli.rs

@@ -849,6 +849,7 @@ mod tests {
                 role.default_workflow()
             )));
         }
+        assert!(!config.contains("[roles.investigator]"));
     }
 
     #[test]

docs/development/work-items.md

@@ -10,7 +10,7 @@ Do not treat ad-hoc chat summaries, memory records, or Pod notifications as the
 
 - `Ticket`: durable project/orchestration record. It contains requirements, decisions, plans, implementation reports, reviews, artifacts, and resolution history.
 - `Task`: session-local progress tracking inside a Pod. It is not the project record.
-- `Assignment`: a concrete delegation from an Orchestrator to a coder/reviewer/investigator Pod.
+- `Assignment`: a concrete delegation from an Orchestrator to a coder/reviewer Pod or task-specific helper Pod.
 - `IntentPacket`: the short implementation/review contract derived from a Ticket and handed to an Assignment.
 - `LocalTicketBackend`: the current `.yoi/tickets/` markdown/thread/artifacts storage backend.
 
@@ -80,11 +80,6 @@ workflow = "multi-agent-workflow"
 profile = "project:reviewer"
 launch_prompt = "$workspace/ticket/reviewer/launch"
 workflow = "multi-agent-workflow"
-
-[roles.investigator]
-profile = "project:investigator"
-launch_prompt = "$workspace/ticket/investigator/launch"
-workflow = "ticket-orchestrator-routing"
 ```
 
 Fixed roles are:
@@ -93,9 +88,10 @@ Fixed roles are:
 - `orchestrator`
 - `coder`
 - `reviewer`
-- `investigator`
 
 This is not an arbitrary role registry. The fixed roles are the roles required by Ticket orchestration.
+Stale `[roles.investigator]` config is rejected as an unsupported fixed role; remove it and,
+when a spike is useful, let the Orchestrator create an ordinary task-specific read-only helper Pod.
 
 `profile` selects the Pod runtime Profile for that role. The selected Profile owns durable role/system behavior. `ticket.config.toml` does not have a role-level `system_instruction` field.
 
@@ -116,7 +112,6 @@ If `.yoi/ticket.config.toml` is missing, defaults are:
   - orchestrator: `ticket-orchestrator-routing`
   - coder: `multi-agent-workflow`
   - reviewer: `multi-agent-workflow`
-  - investigator: `ticket-orchestrator-routing`
 
 Important: top-level Ticket role launches cannot execute `profile = "inherit"` because top-level launch has no parent Profile to inherit from. Configure concrete role profiles in `.yoi/ticket.config.toml` before using `yoi panel` role-launch actions.
 
@@ -227,7 +222,6 @@ Role actions map to the same fixed roles configured in `.yoi/ticket.config.toml`
 
 - intake launches the intake role without an existing Ticket and requires freeform context.
 - route launches the orchestrator role for an existing Ticket.
-- investigate launches the investigator role for a read-only spike/investigation.
 - implement launches the coder role for an implementation assignment.
 - review launches the reviewer role for review.
 
@@ -286,10 +280,6 @@ workflow = "multi-agent-workflow"
 [roles.reviewer]
 profile = "project:reviewer"
 workflow = "multi-agent-workflow"
-
-[roles.investigator]
-profile = "project:investigator"
-workflow = "ticket-orchestrator-routing"
 ```
 
 If a role still uses `profile = "inherit"`, the panel fails closed with a diagnostic explaining that a concrete profile is required.
@@ -298,7 +288,7 @@ If a role still uses `profile = "inherit"`, the panel fails closed with a diagno
 
 - `profile = "inherit"`: configure a concrete role Profile in `.yoi/ticket.config.toml`.
 - malformed `.yoi/ticket.config.toml`: fix the config and retry.
-- missing Ticket id/slug for route, investigate, implement, or review actions: provide the target Ticket.
+- missing Ticket id/slug for route, implement, or review actions: provide the target Ticket.
 - launch success but no visible completion: attach to or inspect the launched Pod; completion notifications are hints, not authority.
 
 ## Granularity